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      <a href="/2017/04/23/three-notes-4-add-keypress-move/" title="three.js笔记4--添加按键移动" itemprop="url">three.js笔记4--添加按键移动</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2017-04-23T01:46:10.000Z" itemprop="datePublished">2017-04-23</time>
    更新日期:<time datetime="2018-12-18T15:39:22.520Z" itemprop="dateModified">2018-12-18</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#添加移动控制"><span class="toc-number">1.</span> <span class="toc-text">添加移动控制</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#基本思路"><span class="toc-number">1.1.</span> <span class="toc-text">基本思路</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加监听事件"><span class="toc-number">1.2.</span> <span class="toc-text">添加监听事件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#进行按键处理"><span class="toc-number">1.3.</span> <span class="toc-text">进行按键处理</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#进行照相机移动"><span class="toc-number">1.4.</span> <span class="toc-text">进行照相机移动</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#完整代码"><span class="toc-number">1.5.</span> <span class="toc-text">完整代码</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">2.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>Three.js是一个3D库，《three.js笔记》系列是在使用three.js中的一些过程和笔记。<br>本文记录添加按键事件，来控制照相机前后左右移动的基本过程。<br><a id="more"></a></p>
<h2 id="添加移动控制"><a href="#添加移动控制" class="headerlink" title="添加移动控制"></a>添加移动控制</h2><hr>
<h3 id="基本思路"><a href="#基本思路" class="headerlink" title="基本思路"></a>基本思路</h3><p>这里我们将添加按键的处理，来控制第一人称（照相机）的移动，基本思路为：</p>
<ul>
<li>添加监听事件</li>
<li>进行按键处理</li>
<li>进行照相机移动</li>
</ul>
<h3 id="添加监听事件"><a href="#添加监听事件" class="headerlink" title="添加监听事件"></a>添加监听事件</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 添加按键时走动</span></div><div class="line"><span class="built_in">document</span>.addEventListener(<span class="string">'keydown'</span>, handleKeyDown, <span class="literal">false</span>);</div></pre></td></tr></table></figure>
<p>这里我们监听的是<code>keydown</code>事件，键盘事件有三个，事件执行的顺序是： keydown-&gt;keypress-&gt;keyup。</p>
<p>但是连续按一个按键的话，会一直触发：keydown keypress。直到你提起按键，会触发keyup。</p>
<p>而这里我们不使用keypress，是因为keypress对: shift、ctrl、上下键等非字符的输入不会触发。</p>
<h3 id="进行按键处理"><a href="#进行按键处理" class="headerlink" title="进行按键处理"></a>进行按键处理</h3><p>这里我们需要进行兼容性处理：</p>
<ol>
<li>event</li>
<li>keyCode</li>
</ol>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">var</span> event = event || <span class="built_in">window</span>.event;</div></pre></td></tr></table></figure>
<p>IE中有<code>window.event</code>对象，firefox没有<code>window.event</code>对象。<br>可以通过给函数的参数传递event对象。 </p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">var</span> keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;</div></pre></td></tr></table></figure>
<p>IE使用<code>e.keyCode</code>获取按键，FireFox和Opera等使用<code>e.which</code>获取按键。</p>
<p>然后我们添加按键判断和处理：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 处理按键</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">handleKeyDown</span>(<span class="params">e</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> e = e || <span class="built_in">window</span>.event;</div><div class="line">    <span class="keyword">var</span> keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;</div><div class="line"></div><div class="line">    <span class="keyword">if</span> (<span class="string">'37, 38, 39, 40, 65, 87, 68, 83'</span>.indexOf(keyCode) === <span class="number">-1</span>) &#123;</div><div class="line">        <span class="keyword">return</span>;</div><div class="line">    &#125; <span class="keyword">else</span> &#123;</div><div class="line">        <span class="keyword">switch</span> (e.keyCode) &#123;</div><div class="line">            <span class="keyword">case</span> <span class="number">37</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">65</span>:</div><div class="line">                CameraMove(<span class="string">'x'</span>, <span class="number">-0.1</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="number">38</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">87</span>:</div><div class="line">                CameraMove(<span class="string">'y'</span>, <span class="number">0.1</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="number">39</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">68</span>:</div><div class="line">                CameraMove(<span class="string">'x'</span>, <span class="number">0.1</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="number">83</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">40</span>:</div><div class="line">                CameraMove(<span class="string">'y'</span>, <span class="number">-0.1</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">        &#125;</div><div class="line">    &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>这里的CameraMove是用来处理camera的移动的。</p>
<h3 id="进行照相机移动"><a href="#进行照相机移动" class="headerlink" title="进行照相机移动"></a>进行照相机移动</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">CameraMove</span>(<span class="params">direction, distance</span>) </span>&#123;</div><div class="line">    camera.position[direction] += distance;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>这时候，我们就能通过上下左右或者是WASD按键控制照相机的移动。</p>
<p>如图：<br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1486894019%281%29.png" alt="image"></p>
<p>移动后：<br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1486906651%281%29.png" alt="image"></p>
<h3 id="完整代码"><a href="#完整代码" class="headerlink" title="完整代码"></a>完整代码</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div><div class="line">72</div><div class="line">73</div><div class="line">74</div><div class="line">75</div><div class="line">76</div><div class="line">77</div><div class="line">78</div><div class="line">79</div><div class="line">80</div><div class="line">81</div><div class="line">82</div><div class="line">83</div><div class="line">84</div><div class="line">85</div><div class="line">86</div><div class="line">87</div><div class="line">88</div><div class="line">89</div><div class="line">90</div><div class="line">91</div><div class="line">92</div><div class="line">93</div><div class="line">94</div><div class="line">95</div><div class="line">96</div><div class="line">97</div><div class="line">98</div><div class="line">99</div><div class="line">100</div><div class="line">101</div><div class="line">102</div><div class="line">103</div><div class="line">104</div><div class="line">105</div><div class="line">106</div><div class="line">107</div><div class="line">108</div><div class="line">109</div><div class="line">110</div><div class="line">111</div><div class="line">112</div><div class="line">113</div><div class="line">114</div><div class="line">115</div><div class="line">116</div><div class="line">117</div><div class="line">118</div><div class="line">119</div><div class="line">120</div><div class="line">121</div><div class="line">122</div><div class="line">123</div><div class="line">124</div><div class="line">125</div><div class="line">126</div><div class="line">127</div><div class="line">128</div><div class="line">129</div><div class="line">130</div><div class="line">131</div><div class="line">132</div><div class="line">133</div><div class="line">134</div><div class="line">135</div><div class="line">136</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 设置场景</span></div><div class="line"><span class="keyword">var</span> scene = <span class="keyword">new</span> THREE.Scene()</div><div class="line"></div><div class="line"><span class="comment">// 创建正交投影照相机</span></div><div class="line"><span class="keyword">var</span> camera = <span class="keyword">new</span> THREE.PerspectiveCamera(<span class="number">75</span>, <span class="built_in">window</span>.innerWidth / <span class="built_in">window</span>.innerHeight, <span class="number">0.1</span>, <span class="number">1000</span>)</div><div class="line">camera.position.set(<span class="number">0</span>, <span class="number">-5</span>, <span class="number">2</span>)</div><div class="line">camera.lookAt(scene.position)</div><div class="line"></div><div class="line"><span class="comment">// 定义着色器</span></div><div class="line"><span class="keyword">var</span> renderer = <span class="keyword">new</span> THREE.WebGLRenderer()</div><div class="line">renderer.setSize(<span class="built_in">window</span>.innerWidth, <span class="built_in">window</span>.innerHeight)</div><div class="line"><span class="built_in">document</span>.body.appendChild(renderer.domElement)</div><div class="line">    <span class="comment">// 告诉渲染器渲染阴影</span></div><div class="line">renderer.shadowMap.enabled = <span class="literal">true</span></div><div class="line">renderer.shadowMap.type = THREE.PCFSoftShadowMap</div><div class="line"></div><div class="line"><span class="comment">// 添加地板</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">initFloor</span>(<span class="params"></span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> floorGeo = <span class="keyword">new</span> THREE.PlaneBufferGeometry(<span class="number">12</span>, <span class="number">8</span>, <span class="number">1</span>, <span class="number">1</span>)</div><div class="line">    <span class="keyword">var</span> floorMaterial = <span class="keyword">new</span> THREE.MeshStandardMaterial(&#123; <span class="attr">color</span>: <span class="string">'#aaaaaa'</span> &#125;)</div><div class="line">    <span class="keyword">var</span> floor = <span class="keyword">new</span> THREE.Mesh(floorGeo, floorMaterial)</div><div class="line">    floor.position.set(<span class="number">0</span>, <span class="number">0</span>, <span class="number">-1</span>)</div><div class="line">    floor.receiveShadow = <span class="literal">true</span>; <span class="comment">// 接受阴影</span></div><div class="line">    scene.add(floor)</div><div class="line">    <span class="keyword">return</span> floor</div><div class="line">&#125;</div><div class="line"><span class="keyword">var</span> floor = initFloor()</div><div class="line"></div><div class="line"><span class="comment">// 添加物体</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">initCube</span>(<span class="params">imageUrl</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> geometry = <span class="keyword">new</span> THREE.BoxGeometry(<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>)</div><div class="line">    <span class="keyword">var</span> material</div><div class="line">    <span class="keyword">if</span> (imageUrl) &#123;</div><div class="line">        material = <span class="keyword">new</span> THREE.MeshLambertMaterial(&#123;</div><div class="line">            <span class="attr">map</span>: THREE.ImageUtils.loadTexture(imageUrl)</div><div class="line">        &#125;)</div><div class="line">    &#125; <span class="keyword">else</span> &#123;</div><div class="line">        material = <span class="keyword">new</span> THREE.MeshLambertMaterial()</div><div class="line">    &#125;</div><div class="line">    <span class="keyword">var</span> cube = <span class="keyword">new</span> THREE.Mesh(geometry, material)</div><div class="line">    cube.castShadow = <span class="literal">true</span>; <span class="comment">// 要产生阴影</span></div><div class="line">    scene.add(cube)</div><div class="line">    <span class="keyword">return</span> cube</div><div class="line">&#125;</div><div class="line"><span class="comment">// 添加物体</span></div><div class="line"><span class="keyword">var</span> cube1 = initCube(<span class="string">'./img/1.jpg'</span>)</div><div class="line"><span class="keyword">var</span> cube2 = initCube(<span class="string">'./img/2.png'</span>)</div><div class="line"><span class="keyword">var</span> cube3 = initCube()</div><div class="line"><span class="keyword">var</span> cube4 = initCube()</div><div class="line">cube1.position.set(<span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>)</div><div class="line">cube2.position.set(<span class="number">-2</span>, <span class="number">0</span>, <span class="number">0</span>)</div><div class="line">cube3.position.set(<span class="number">0</span>, <span class="number">-2</span>, <span class="number">1</span>)</div><div class="line">cube4.position.set(<span class="number">1</span>, <span class="number">1</span>, <span class="number">3</span>)</div><div class="line"></div><div class="line"><span class="comment">// 添加聚光灯光源</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">initLight</span>(<span class="params"></span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> light = <span class="keyword">new</span> THREE.SpotLight(<span class="number">0xffffff</span>)</div><div class="line">    light.position.set(<span class="number">0</span>, <span class="number">-3</span>, <span class="number">4</span>)</div><div class="line">    light.target = floor; <span class="comment">// 投射方向指向地板</span></div><div class="line">    light.castShadow = <span class="literal">true</span>; <span class="comment">// 用于产生阴影</span></div><div class="line">    scene.add(light)</div><div class="line">        <span class="comment">// 光源的阴影设置</span></div><div class="line">    light.shadow.mapSize.width = <span class="number">512</span> <span class="comment">// default</span></div><div class="line">    light.shadow.mapSize.height = <span class="number">512</span> <span class="comment">// default</span></div><div class="line">    light.shadow.camera.near = <span class="number">0.5</span> <span class="comment">// default</span></div><div class="line">    light.shadow.camera.far = <span class="number">500</span> <span class="comment">// default</span></div><div class="line">    <span class="keyword">var</span> helper = <span class="keyword">new</span> THREE.CameraHelper(light.shadow.camera)</div><div class="line">    scene.add(helper)</div><div class="line">&#125;</div><div class="line">initLight()</div><div class="line"></div><div class="line"><span class="comment">// 让世界动起来</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">render</span>(<span class="params"></span>) </span>&#123;</div><div class="line">    requestAnimationFrame(render)</div><div class="line"></div><div class="line">    <span class="comment">// 此处可添加动画处理</span></div><div class="line">    cube1.rotation.x += <span class="number">0.03</span></div><div class="line">    cube1.rotation.y += <span class="number">0.03</span></div><div class="line"></div><div class="line">    cube2.rotation.x += <span class="number">0.02</span></div><div class="line">    cube3.rotation.y += <span class="number">0.01</span></div><div class="line">    cube4.rotation.x -= <span class="number">0.04</span></div><div class="line"></div><div class="line">    renderer.render(scene, camera)</div><div class="line">&#125;</div><div class="line"><span class="comment">// 添加文字</span></div><div class="line"><span class="keyword">var</span> loader = <span class="keyword">new</span> THREE.FontLoader();</div><div class="line">loader.load(<span class="string">'./js/font.json'</span>, <span class="function"><span class="keyword">function</span>(<span class="params">font</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> mesh = <span class="keyword">new</span> THREE.Mesh(<span class="keyword">new</span> THREE.TextGeometry(<span class="string">'Please press Up/Down/Ledt/Right or W/A/S/D'</span>, &#123;</div><div class="line">        <span class="attr">font</span>: font,</div><div class="line">        <span class="attr">size</span>: <span class="number">0.4</span>,</div><div class="line">        <span class="attr">height</span>: <span class="number">0.1</span></div><div class="line">    &#125;), <span class="keyword">new</span> THREE.MeshLambertMaterial());</div><div class="line">    mesh.position.set(<span class="number">-5</span>, <span class="number">2</span>, <span class="number">2</span>);</div><div class="line">    mesh.rotation.set(<span class="number">1.2</span>, <span class="number">0</span>, <span class="number">0</span>)</div><div class="line">    scene.add(mesh);</div><div class="line"></div><div class="line">    render();</div><div class="line">&#125;);</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment">// 添加按键时走动</span></div><div class="line"><span class="built_in">document</span>.addEventListener(<span class="string">'keydown'</span>, handleKeyDown, <span class="literal">false</span>);</div><div class="line"></div><div class="line"><span class="comment">// 处理按键</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">handleKeyDown</span>(<span class="params">e</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> e = e || <span class="built_in">window</span>.event;</div><div class="line">    <span class="keyword">var</span> keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;</div><div class="line"></div><div class="line">    <span class="keyword">if</span> (<span class="string">'37, 38, 39, 40, 65, 87, 68, 83'</span>.indexOf(keyCode) === <span class="number">-1</span>) &#123;</div><div class="line">        <span class="keyword">return</span>;</div><div class="line">    &#125; <span class="keyword">else</span> &#123;</div><div class="line">        <span class="keyword">switch</span> (e.keyCode) &#123;</div><div class="line">            <span class="keyword">case</span> <span class="number">37</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">65</span>:</div><div class="line">                CameraMove(<span class="string">'x'</span>, <span class="number">-0.1</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="number">38</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">87</span>:</div><div class="line">                CameraMove(<span class="string">'y'</span>, <span class="number">0.1</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="number">39</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">68</span>:</div><div class="line">                CameraMove(<span class="string">'x'</span>, <span class="number">0.1</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">            <span class="keyword">case</span> <span class="number">83</span>:</div><div class="line">            <span class="keyword">case</span> <span class="number">40</span>:</div><div class="line">                CameraMove(<span class="string">'y'</span>, <span class="number">-0.1</span>);</div><div class="line">                <span class="keyword">break</span>;</div><div class="line">        &#125;</div><div class="line">    &#125;</div><div class="line">&#125;</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">CameraMove</span>(<span class="params">direction, distance</span>) </span>&#123;</div><div class="line">    camera.position[direction] += distance;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>这节主要讲了给第一人称（照相机）添加按键事件处理的基本过程。这里我们只考虑了前后左右的移动，包括视觉角度等的都没有进行计算和控制，后面章节我们会把这些方面也一并添加进去处理。<br><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/three-notes/4-add-keypress-move" target="_blank" rel="external">此处查看项目代码</a><br><a href="http://three-notes.godbasin.com/three-notes-4-add-keypress-move/index.html" target="_blank" rel="external">此处查看页面效果</a></p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
	</div>
	<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/2code2.jpg" width="200" height="200" style="display:block;margin: 0 auto;" />
	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <strong class="toc-title">文章目录</strong>
  <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#添加移动控制"><span class="toc-number">1.</span> <span class="toc-text">添加移动控制</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#基本思路"><span class="toc-number">1.1.</span> <span class="toc-text">基本思路</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#添加监听事件"><span class="toc-number">1.2.</span> <span class="toc-text">添加监听事件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#进行按键处理"><span class="toc-number">1.3.</span> <span class="toc-text">进行按键处理</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#进行照相机移动"><span class="toc-number">1.4.</span> <span class="toc-text">进行照相机移动</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#完整代码"><span class="toc-number">1.5.</span> <span class="toc-text">完整代码</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">2.</span> <span class="toc-text">结束语</span></a></li></ol>
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